TY  - JOUR
A1  - Hayer, Anna
A1  - de Halleux, Veronique
A1  - Köhler, Anna
A1  - El-Garoughy, Abdel
A1  - Meijer, E. W.
A1  - Barbera, Joaquin
A1  - Tant, Julien
A1  - Levin, Jeremy
A1  - Lehmann, Matthias
A1  - Gierschner, Johannes
A1  - Cornil, Jerome
A1  - Geerts, Yves Henri
T1  - Highly fluorescent crystalline and liquid crystalline columnar phases of pyrene-based structures
N2  - A concept for highly ordered solid-state structures with bright fluorescence is proposed: liquid crystals based on tetraethynylpyrene chromophores, where the rigid core is functionalized with flexible, promesogenic alkoxy chains. The synthesis of this novel material is presented. The therniotropic properties are studied by means of differential scanning calorimetry (DSC), cross-polarized optical microscopy (POM), and X-ray diffraction. The mesogen possesses an enantiotropic Col(h) phase over a large temperature range before clearing. The material is highly fluorescent in solution and, most remarkably, in the condensed state, with a broad, strongly red shifted emission. Fluorescence quantum yields (Phi(F)) have been determined to be 70% in dichloromethane solution and 62% in the solid state. Concentration- and temperature-dependent absorption and emission studies as well as quantum-chemical calculations on isolated molecules and dimers are used to clarify the type of intermolecular interactions present as well as their influence on the fluorescence quantum yield and spectral properties of the material. The high luminescence efficiency in the solid state is ascribed to rotated chromophores, leading to an optically allowed lowest optical transition
Y1  - 2006
UR  - http://pubs.acs.org/journal/jpcbfk
U6  - https://doi.org/10.1021/Jp0573689
SN  - 1520-6106
ER  - 
TY  - GEN
A1  - Meyer, Matthias
A1  - Palkopoulou, Eleftheria
A1  - Baleka, Sina Isabelle
A1  - Stiller, Mathias
A1  - Penkman, Kirsty E. H.
A1  - Alt, Kurt W.
A1  - Ishida, Yasuko
A1  - Mania, Dietrich
A1  - Mallick, Swapan
A1  - Meijer, Tom
A1  - Meller, Harald
A1  - Nagel, Sarah
A1  - Nickel, Birgit
A1  - Ostritz, Sven
A1  - Rohland, Nadin
A1  - Schauer, Karol
A1  - Schüler, Tim
A1  - Roca, Alfred L.
A1  - Reich, David
A1  - Shapiro, Beth
A1  - Hofreiter, Michael
T1  - Palaeogenomes of Eurasian straight-tusked elephants challenge the current view of elephant evolution
T2  - Postprints der Universität Potsdam Mathematisch-Naturwissenschaftliche Reihe
N2  - The straight-tusked elephants Palaeoloxodon spp. were widespread across Eurasia during the Pleistocene. Phylogenetic reconstructions using morphological traits have grouped them with Asian elephants (Elephas maximus), and many paleontologists place Palaeoloxodon within Elephas. Here, we report the recovery of full mitochondrial genomes from four and partial nuclear genomes from two P. antiquus fossils. These fossils were collected at two sites in Germany, Neumark-Nord and Weimar-Ehringsdorf, and likely date to interglacial periods similar to 120 and similar to 244 thousand years ago, respectively. Unexpectedly, nuclear and mitochondrial DNA analyses suggest that P. antiquus was a close relative of extant African forest elephants (Loxodonta cyclotis). Species previously referred to Palaeoloxodon are thus most parsimoniously explained as having diverged from the lineage of Loxodonta, indicating that Loxodonta has not been constrained to Africa. Our results demonstrate that the current picture of elephant evolution is in need of substantial revision.
T3  - Zweitveröffentlichungen der Universität Potsdam : Mathematisch-Naturwissenschaftliche Reihe - 790 
KW  - genome sequence
KW  - woolly mammoth
KW  - Palaeoloxodon-antiquus
KW  - phylogenetic analysis
KW  - African elephants
KW  - DNA
KW  - Pleistocene
KW  - alignment
KW  - ancient
KW  - reveal
Y1  - 2019
U6  - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:kobv:517-opus4-440139
SN  - 1866-8372
IS  - 790
ER  - 
TY  - JOUR
A1  - Meyer, Matthias
A1  - Palkopoulou, Eleftheria
A1  - Baleka, Sina Isabelle
A1  - Stiller, Mathias
A1  - Penkman, Kirsty E. H.
A1  - Alt, Kurt W.
A1  - Ishida, Yasuko
A1  - Mania, Dietrich
A1  - Mallick, Swapan
A1  - Meijer, Tom
A1  - Meller, Harald
A1  - Nagel, Sarah
A1  - Nickel, Birgit
A1  - Ostritz, Sven
A1  - Rohland, Nadin
A1  - Schauer, Karol
A1  - Schueler, Tim
A1  - Roca, Alfred L.
A1  - Reich, David
A1  - Shapiro, Beth
A1  - Hofreiter, Michael
T1  - Palaeogenomes of Eurasian straight-tusked elephants challenge the current view of elephant evolution
JF  - eLife
N2  - The straight-tusked elephants Palaeoloxodon spp. were widespread across Eurasia during the Pleistocene. Phylogenetic reconstructions using morphological traits have grouped them with Asian elephants (Elephas maximus), and many paleontologists place Palaeoloxodon within Elephas. Here, we report the recovery of full mitochondrial genomes from four and partial nuclear genomes from two P. antiquus fossils. These fossils were collected at two sites in Germany, Neumark-Nord and Weimar-Ehringsdorf, and likely date to interglacial periods similar to 120 and similar to 244 thousand years ago, respectively. Unexpectedly, nuclear and mitochondrial DNA analyses suggest that P. antiquus was a close relative of extant African forest elephants (Loxodonta cyclotis). Species previously referred to Palaeoloxodon are thus most parsimoniously explained as having diverged from the lineage of Loxodonta, indicating that Loxodonta has not been constrained to Africa. Our results demonstrate that the current picture of elephant evolution is in need of substantial revision.
Y1  - 2017
U6  - https://doi.org/10.7554/eLife.25413
SN  - 2050-084X
VL  - 6
PB  - eLife Sciences Publications
CY  - Cambridge
ER  -